PatchSiren cyber security CVE debrief
CVE-2026-50590 Mimecast CVE debrief
CVE-2026-50590 is a vulnerability in Mimecast Incydr before version 2.6.0, allowing for arbitrary file access. The vulnerability has a CVSS score of 4.5, classified as MEDIUM severity. It was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-50590) and last modified on [cveModifiedAt](https://nvd.nist.gov/vuln/detail/CVE-2026-50590).
- Vendor
- Mimecast
- Product
- Incydr
- CVSS
- MEDIUM 4.5
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-05
- Original CVE updated
- 2026-07-23
- Advisory published
- 2026-06-05
- Advisory updated
- 2026-07-23
Who should care
Users of Mimecast Incydr before version 2.6.0 should apply the necessary updates to prevent arbitrary file access.
Technical summary
The vulnerability exists in Mimecast Incydr before 2.6.0, enabling unauthorized file access. The CVSS vector is CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N, with a primary weakness of CWE-732.
Defensive priority
Apply the update to Mimecast Incydr version 2.6.0 or later to mitigate the vulnerability.
Recommended defensive actions
- Update Mimecast Incydr to version 2.6.0 or later.
- Review and apply security patches as recommended by the vendor.
Evidence notes
Evidence suggests that the vendor is 'Unknown Vendor' with low confidence, and the product name is not specified. Further review is needed.
Sources and references
Verified primary and authoritative sources
-
CVE-2026-50590 CVE Program record
Publisher, destination, and source semantics verified
URL: https://www.cve.org/CVERecord?id=CVE-2026-50590
CVE Program - Official CVE Program record with source-provided CVE metadata.
-
CVE-2026-50590 NVD vulnerability detail
Publisher, destination, and source semantics verified
URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50590
NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.
Supplemental references
-
Source reference
Unverified legacy reference
URL: https://mimecastsupport.zendesk.com/hc/en-us/articles/42665910976659-Insider-risk-agent-release-notes
Methodology and review provenance
AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.